//C++ header - Open Scene Graph - Copyright (C) 1998-2002 Robert Osfield
//Distributed under the terms of the GNU Library General Public License (LGPL)
//as published by the Free Software Foundation.

// -*-c++-*-

#ifndef OSG_TEXTURECUBEMAP
#define OSG_TEXTURECUBEMAP 1

#include <osg/Texture>

#ifndef GL_TEXTURE_CUBE_MAP
#define GL_TEXTURE_CUBE_MAP 0x8513
#endif

namespace osg {

/** TextureCubeMap state class which encapsulates OpenGl texture cubemap functionality.*/
class SG_EXPORT TextureCubeMap : public Texture
{

    public :
        
        TextureCubeMap();

        /** Copy constructor using CopyOp to manage deep vs shallow copy.*/
        TextureCubeMap(const TextureCubeMap& cm,const CopyOp& copyop=CopyOp::SHALLOW_COPY):
            Texture(cm,copyop) {}

        META_StateAttribute(osg, TextureCubeMap,TEXTURE);
        
        /** return -1 if *this < *rhs, 0 if *this==*rhs, 1 if *this>*rhs.*/
        virtual int compare(const StateAttribute& rhs) const;

        enum Face {
            POSITIVE_X=0,
            NEGATIVE_X=1,
            POSITIVE_Y=2,
            NEGATIVE_Y=3,
            POSITIVE_Z=4,
            NEGATIVE_Z=5
        };

        /** Set the texture image for specified face. */
        void setImage(const Face, Image* image);

        /** Get the texture image for specified face. */
        Image* getImage(const Face);

        /** Get the const texture image for specified face. */
        const Image* getImage(const Face) const;

        /** On first apply (unless already compiled), create the minmapped 
          * texture and bind it, subsequent apply will simple bind to texture.*/
        virtual void apply(State& state) const;

    protected :

        virtual ~TextureCubeMap();
        bool imagesValid() const;
        void setImage(Image*) {}  // prevent call to Texture::setImage(Image* image)
        Image* getImage() { return _image.get(); }  // prevent call to Texture::setImage(Image* image)
        const Image* getImage() const { return _image.get(); }  // prevent call to Texture::setImage(Image* image)

        mutable ref_ptr<Image> _images[6];
};

}

#endif
